Ballpoint pen



FIG. 1 is a left front perspective view of a ballpoint pen showing mynew design;

FIG. 2 is a rear elevational view;

FIG. 3 is a side elevational view;

FIG. 4 is a front elevational view;

FIG. 5 is a top plan view; and,

FIG. 6 is a bottom plan view thereof.

The ornamental design for a ballpoint pen, as shown and described.